The root session deamon will see all application from any users On Sep 10, 2012 10:51 AM, "Alexandre Montplaisir" <alexmon...@voxpopuli.im> wrote:
> Hi, > > In your example, you are running the tracer as root (with "sudo") but your > application is run by your own user. Somebody correct me if I'm wrong, but > I assume that in a case like this the root tracer will not see the other > user's applications. > > Could you try running the lttng commands without sudo, so that it creates > a session for your user only. > > > Cheers, > Alexandre > > > > On 12-09-10 03:32 AM, Per Nilsson wrote: > > Hi, > I am trying to get started with userspace tracing with LTTng, but I am having > a hard time to get it to work. > I'm using Ubunto 11.04, with kernel version: 2.6.38-8-generic. > > I downloaded and compiled the following lttng software: > > Userspace-rcu-0.7.4 > Lttng-ust-2.0.5 > Lttng-tools-2-0.4 > Babeltrace-1.0.0-rc5 > > Maybe some one can tell me what is wrong. > > // This is command line command I use to start the trace session. > > per@per-VirtualBox:~$ sudo lttng create foo > [sudo] password for per: > Session foo created. > Traces will be written in /home/per/lttng-traces/foo-20120905-135905 > per@per-VirtualBox:~$ sudo lttng enable-event -a -u > All UST events are enabled in channel channel0 > per@per-VirtualBox:~$ sudo lttng start > Tracing started for session foo > per@per-VirtualBox:~$ sudo lttng stop > Tracing stopped for session foo > per@per-VirtualBox:~$ sudo ls /home/per/lttng-traces/foo-20120905-135905/ust > per@per-VirtualBox:~$ sudo babeltrace > /home/per/lttng-traces/foo-20120905-135905/ust > [error] Cannot open any trace for reading. > > [error] opening trace "/home/per/lttng-traces/foo-20120905-135905/ust" for > reading. > > [error] none of the specified trace paths could be opened. > > // This is the traces from the lttng-sessiond > > per@per-VirtualBox:~$ sudo lttng-sessiond --verbose --verbose-consumer > DEBUG3: Creating LTTng run directory: /var/run/lttng [in > create_lttng_rundir() at main.c:4317] > DEBUG1: Client socket path /var/run/lttng/client-lttng-sessiond [in main() at > main.c:4609] > DEBUG1: Application socket path /var/run/lttng/apps-lttng-sessiond [in main() > at main.c:4610] > DEBUG1: LTTng run directory path: /var/run/lttng [in main() at main.c:4611] > DEBUG3: Created hashtable size 4 at 0x1d4e0a0 of type 1 [in lttng_ht_new() at > hashtable.c:96] > DEBUG3: Created hashtable size 4 at 0x1d4e340 of type 1 [in lttng_ht_new() at > hashtable.c:96] > FATAL: Module lttng_tracer not found. > Error: Unable to load module lttng-tracer > DEBUG1: Failed to open /proc/lttng [in init_kernel_tracer() at main.c:1871] > Error: Unable to remove module lttng-tracer > Warning: No kernel tracer available > DEBUG1: Signal handler set for SIGTERM, SIGPIPE and SIGINT [in > set_signal_handler() at main.c:4451] > Warning: No tracing group detected > DEBUG1: epoll set max size is 100188 [in compat_epoll_set_max_size() at > compat-epoll.c:224] > DEBUG1: Thread manage kernel started [in thread_manage_kernel() at main.c:876] > DEBUG1: Updating kernel poll set [in update_kernel_poll() at main.c:748] > DEBUG1: Thread kernel polling on 2 fds [in thread_manage_kernel() at > main.c:905] > DEBUG1: [thread] Manage application started [in thread_manage_apps() at > main.c:1179] > DEBUG1: Apps thread polling on 2 fds [in thread_manage_apps() at main.c:1200] > DEBUG1: [thread] Manage application registration started [in > thread_registration_apps() at main.c:1392] > DEBUG1: Notifying applications of session daemon state: 1 [in > notify_ust_apps() at main.c:687] > DEBUG1: Got the wait shm fd 17 [in get_wait_shm() at shm.c:117] > DEBUG1: Futex wait update active 1 [in futex_wait_update() at futex.c:62] > DEBUG1: Accepting application registration [in thread_registration_apps() at > main.c:1423] > DEBUG1: [thread] Dispatch UST command started [in > thread_dispatch_ust_registration() at main.c:1324] > DEBUG1: Futex n to 1 prepare done [in futex_nto1_prepare() at futex.c:73] > DEBUG1: Woken up but nothing in the UST command queue [in > thread_dispatch_ust_registration() at main.c:1334] > DEBUG1: [thread] Manage client started [in thread_manage_clients() at > main.c:3794] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3863] > DEBUG1: Receiving data from client ... [in thread_manage_clients() at > main.c:3898] > DEBUG1: Nothing recv() from client... continuing [in thread_manage_clients() > at main.c:3902] > DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3863] > DEBUG1: Receiving data from client ... [in thread_manage_clients() at > main.c:3898] > DEBUG1: Processing client command 8 [in process_client_msg() at main.c:3309] > DEBUG3: mkdir() recursive /home/per/lttng-traces/foo-20120905-135905 with > mode 504 for uid 0 and gid 0 [in run_as_mkdir_recursive() at runas.c:339] > DEBUG1: Using run_as_clone [in run_as() at runas.c:323] > DEBUG1: Tracing session foo created in > /home/per/lttng-traces/foo-20120905-135905 with ID 1 by UID 0 GID 0 [in > session_create() at session.c:232] > DEBUG1: Sending response (size: 16, retcode: Success) [in > thread_manage_clients() at main.c:3936] > DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3863] > DEBUG1: Receiving data from client ... [in thread_manage_clients() at > main.c:3898] > DEBUG1: Nothing recv() from client... continuing [in thread_manage_clients() > at main.c:3902] > DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3863] > DEBUG1: Receiving data from client ... [in thread_manage_clients() at > main.c:3898] > DEBUG1: Processing client command 6 [in process_client_msg() at main.c:3309] > DEBUG1: Getting session foo by name [in process_client_msg() at main.c:3364] > DEBUG1: Creating UST session [in create_ust_session() at main.c:1965] > DEBUG3: Created hashtable size 4 at 0x1d55840 of type 1 [in lttng_ht_new() at > hashtable.c:96] > DEBUG3: Created hashtable size 4 at 0x1d55b00 of type 1 [in lttng_ht_new() at > hashtable.c:96] > DEBUG3: Created hashtable size 4 at 0x1d55dc0 of type 0 [in lttng_ht_new() at > hashtable.c:96] > DEBUG3: mkdir() recursive /home/per/lttng-traces/foo-20120905-135905/ust with > mode 504 for uid 0 and gid 0 [in run_as_mkdir_recursive() at runas.c:339] > DEBUG1: Using run_as_clone [in run_as() at runas.c:323] > DEBUG1: Spawning consumerd [in spawn_consumerd() at main.c:1659] > DEBUG1: [thread] Manage consumer started [in thread_manage_consumer() at > main.c:982] > DEBUG1: Using 64-bit UST consumer at: > /usr/local/lib/lttng/libexec/lttng-consumerd [in spawn_consumerd() at > main.c:1733] > DEBUG3: Created hashtable size 4 at 0x247d030 of type 1 [in lttng_ht_new() at > hashtable.c:96] > DEBUG3: Created hashtable size 4 at 0x247d2f0 of type 1 [in lttng_ht_new() at > hashtable.c:96] > DEBUG1: Connecting to error socket /var/run/lttng/ustconsumerd64/error [in > main() at lttng-consumerd.c:349] > DEBUG1: Updating poll fd array [in consumer_update_poll_array() at > consumer.c:521] > DEBUG1: polling on 1 fd [in lttng_consumer_thread_poll_fds() at > consumer.c:1013] > DEBUG1: Creating command socket /var/run/lttng/ustconsumerd64/command [in > lttng_consumer_thread_receive_fds() at consumer.c:1160] > DEBUG1: Sending ready command to lttng-sessiond [in > lttng_consumer_thread_receive_fds() at consumer.c:1173] > DEBUG1: consumer command socket ready [in thread_manage_consumer() at > main.c:1062] > DEBUG3: Created hashtable size 4 at 0x1d57720 of type 0 [in lttng_ht_new() at > hashtable.c:96] > DEBUG3: Created hashtable size 4 at 0x1d579e0 of type 1 [in lttng_ht_new() at > hashtable.c:96] > DEBUG3: Created hashtable size 4 at 0x1d57f00 of type 1 [in lttng_ht_new() at > hashtable.c:96] > DEBUG1: UST app creating event * for all apps for session id 1 [in > ust_app_create_event_glb() at ust-app.c:1916] > DEBUG1: Event UST * created in channel channel0 [in > event_ust_enable_tracepoint() at event.c:486] > DEBUG1: Sending response (size: 16, retcode: Success) [in > thread_manage_clients() at main.c:3936] > DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > DEBUG1: Connection on client_socket [in lttng_consumer_thread_receive_fds() > at consumer.c:1196] > DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3863] > DEBUG1: Receiving data from client ... [in thread_manage_clients() at > main.c:3898] > DEBUG1: Nothing recv() from client... continuing [in thread_manage_clients() > at main.c:3902] > DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3863] > DEBUG1: Receiving data from client ... [in thread_manage_clients() at > main.c:3898] > DEBUG1: Processing client command 16 [in process_client_msg() at main.c:3309] > DEBUG1: Getting session foo by name [in process_client_msg() at main.c:3364] > DEBUG1: Starting all UST traces [in ust_app_start_trace_all() at > ust-app.c:2207] > DEBUG1: Sending response (size: 16, retcode: Success) [in > thread_manage_clients() at main.c:3936] > DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3863] > DEBUG1: Receiving data from client ... [in thread_manage_clients() at > main.c:3898] > DEBUG1: Nothing recv() from client... continuing [in thread_manage_clients() > at main.c:3902] > DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > DEBUG1: Wait for client response [in thread_manage_clients() at main.c:3863] > DEBUG1: Receiving data from client ... [in thread_manage_clients() at > main.c:3898] > DEBUG1: Processing client command 17 [in process_client_msg() at main.c:3309] > DEBUG1: Getting session foo by name [in process_client_msg() at main.c:3364] > DEBUG1: Stopping all UST traces [in ust_app_stop_trace_all() at > ust-app.c:2233] > DEBUG1: Sending response (size: 16, retcode: Success) [in > thread_manage_clients() at main.c:3936] > DEBUG1: Clean command context structure [in clean_command_ctx() at main.c:534] > DEBUG1: Accepting client command ... [in thread_manage_clients() at > main.c:3826] > > // this is the traces from the small test application > per@per-VirtualBox:/usr/local/src/lttng-ust-2.0.5/doc/examples/gen-tp$ export > LTTNG_UST_DEBUG=1per@per-VirtualBox:/usr/local/src/lttng-ust-2.0.5/doc/examples/gen-tp$ > ./sample liblttng_ust_tracepoint[1748/1748]: just registered a tracepoints > section from 0x7f431694fc38 and having 1 tracepoints (in > tracepoint_register_lib() at tracepoint.c:641) > liblttng_ust_tracepoint[1748/1748]: registered tracepoint: lttng_ust:metadata > (in tracepoint_register_lib() at tracepoint.c:646) > libust[1748/1748]: LTT : ltt ring buffer client init > (in ltt_ring_buffer_metadata_client_init() at > ltt-ring-buffer-metadata-client.h:334) > libust[1748/1748]: LTT : ltt ring buffer client init > (in ltt_ring_buffer_client_overwrite_init() at ltt-ring-buffer-client.h:584) > libust[1748/1748]: LTT : ltt ring buffer client init > (in ltt_ring_buffer_client_discard_init() at ltt-ring-buffer-client.h:584) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Waiting for local apps sessiond (in wait_for_sessiond() at > lttng-ust-comm.c:638) > libust[1748/1750]: Linux kernels 2.6.33 to 3.0 (with the exception of stable > versions) do not support FUTEX_WAKE on read-only memory mappings correctly. > Please upgrade your kernel (fix is commit > 9ea71503a8ed9184d2d0b8ccc4d269d05f7940ae in Linux kernel mainline). LTTng-UST > will use polling mode fallback. (in wait_for_sessiond() at > lttng-ust-comm.c:651) > libust[1748/1750]: Error: futex: Bad address (in wait_for_sessiond() at > lttng-ust-comm.c:653) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1748]: just registered probe sample_tracepoint containing 1 > events (in ltt_probe_register() at ltt-probes.c:109) > libust[1748/1748]: Registered event probe "sample_tracepoint:message" with > signature "char *, text" (in ltt_probe_register() at ltt-probes.c:118) > liblttng_ust_tracepoint[1748/1748]: just registered a tracepoints section > from 0x602138 and having 1 tracepoints (in tracepoint_register_lib() at > tracepoint.c:641) > liblttng_ust_tracepoint[1748/1748]: registered tracepoint: > sample_tracepoint:message (in tracepoint_register_lib() at tracepoint.c:646) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1749]: Info: sessiond not accepting connections to global apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > libust[1748/1750]: Info: sessiond not accepting connections to local apps > socket (in ust_listener_thread() at lttng-ust-comm.c:716) > > BR > /Per Nilsson > > > > > > > > _______________________________________________ > lttng-dev mailing > listlttng-dev@lists.lttng.orghttp://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > >
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